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Thanks for playing! To progress through the waves, you need to destroy the swords stuck in the walls (they have a pulsing effect). If you did destroy them and new ones didn't spawn, then it's a bug. Let me know if that was the case! 

Thanks for playing! That's my fault for not making it clearer - that number is a move counter, not a timer. The puzzle is designed so that you have to step on the green tile on your exact last possible move to complete the level.